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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5356e67c6130c088323546faa636f16ce5fee880e9d3269b38f1c754f79cbf' 
  AND token = 'D9+ed7Z0ZyhChMvnQRdY9fUYZv5/M3IjSm6IbjO9GYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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