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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa93934b4a79b99e53abf978e4931ae030c2ed7914fce47191587dcbb61cda8d' 
  AND token = 'l/2jCG0Ova979uYKoChMdPRxlmSiR0V+riMoHMddQdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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