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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd35cde88d215deb346ca1953faa104759d367ed96a2b45e5a69820ae1ad12c' 
  AND token = 'exsfGstLKZsJcP2CXEk0kxP19S3f8xrNp0Uzzv0r/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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