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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db000d106feded7307d9c00d74154637a181aae3c2a23017cd0e92dd29b7c376' 
  AND token = 'xWUMmRvUiF0/I2slcC9ptTMBZrx487xO+Tm/7PgI99w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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