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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdce268dca0f4fb9055a4cd7c51dd76b64023af2c3af8b1165a4ebd620bb3087' 
  AND token = 'lLNTalRRWxaEDjpvPEECQQPdArfKkS7mPEge9wQxbXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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