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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063ec0d8308727a64549de5b4c91f65a6c0ecf394bf4e3f29c4fcbd466507b6c' 
  AND token = 'keKmULU1QQGu5/LXWdNtYGH5lPOOMan3HBRH4elcLac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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