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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f90c4a008adf5bdd7d50d7658a46a5925c4b6e804c6c79e880f5cd1b1493f9b' 
  AND token = 'nWOF0hOjxphV5fHhbmPQBY3KJC/kP71OejOkWOWdmq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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