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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c59d4d8378e7e275c98f4c518779140a8707762ab221922fd4168897f11f34' 
  AND token = 'CQ6nI99K/UuOdOcBS5ehDf3KktWakESTQfPL8xNP9MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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