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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac48d6d64b5098cb7b257ee4affde68ca89b34b86f2bf30919ab4a2203b1698' 
  AND token = 'AQOzI1X/3Cvn9fDg0dVZisSXRFLOsdy0NnhAKN+JZyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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