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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04517827ff7487cc65b26039930e7ce89420fd5d6522623804a27de73aa2a1ab' 
  AND token = 'cyAxpdcS0BXpXFbq4bkNiAyvblndWMdNRHyg19UETk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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