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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4934199d6ebd6a9b45e21a93bb1ffcab60d55e7615bc16af59ff29945e29e3e7' 
  AND token = 'LIw3n8sKwCPCVvWC386VjrKWy8+9+x7xCPGmHkSc9kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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