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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e185d25a67cd59b1b6bb1c2c4d3894a06038f05717a0e22d0eb9cdb89bd1be' 
  AND token = 'g7ztsWc4C44IhRkP/vtkACLsrp3orGnsQZ6Byr65tYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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