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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116a29449c9693ee8019abd7b667524f8c8cabd7a7fd4c16d3e972d56efed5ad' 
  AND token = 'eKs0G1C4TuksOKVAl8VgNujeUyVyxu6TE5iX3B6/U34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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