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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac67e98e9dcabb274e8993f30c645617d4c065e8053f1727ffcaf228494f20e8' 
  AND token = '3I6RqJtk1S1bFKzM6JdUGK5TVv4kiMp+0cR89lRClBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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