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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00010535269989a4f992c5a192b29197d92900a12fe8ac3356bfd5b36ec750fc' 
  AND token = '7xtu6ehzj3PeL9uqtGXIRWaob34g23RDpxXKfkB0W6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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