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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b119d1693542f530f86b04d2e94190294323c49399df9aea7565b6d74d520c2e' 
  AND token = 'Wrl/ArP1s/ff6D0vtP8AEOz4bFAZFmDMTdPNbo00VTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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