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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e352752de50c7ea25b7d028b081a6e6c38291ff09af31e323a33d606009c372' 
  AND token = 'qJOf66uEgH79Fv1azJnjePpmAokK1N4IAeBYeJtYANA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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