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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde9796a77997175208198aa225c02248efbb8bf1675b701938e6b77f2a3ec66' 
  AND token = 'y+5fXq4QOoYUgST6BxoIpnRmSSGoK2qFtB83ubfYgoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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