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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca8c7a94f1418cf3891af4a3804e0c28358849b157cf1b03d253e8bbe909efa' 
  AND token = '6VQtKNKOShM7hpJzp3JXReemla2WJGNAk0feE9TiqJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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