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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cf4d8be02d194409f65d146844215b5c73c3968e77ea2d7fd0b06f8677e6f1' 
  AND token = '0XBx6f7553BrjfkcY1KtX8lsKV6jS4sYTdhSstFPC9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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