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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae18f5bc5386f8a2e8175fbf4c11bb6fd4e26ea6cf4eb8bffe8c7a53364c17e' 
  AND token = 'XhlX1WoUlIo5UVHMa0vQaQFGrwR9g2vMhLGR4qSfT5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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