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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff6cc20e968ee7a21c3fcef63d24f53248979cf06ba8064def9311e572d0769' 
  AND token = 'vse5nE+NHa8bmV1E/Hel3I4SjwaJKZU+jhGSiRViHS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}