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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cc11ef952f66be216f16175c98fd101ca1f042bf603da1b9562f52194a2874' 
  AND token = 'hyilp7y/9iaE/q4WSZjguNsUfiW0FHDjjcRr7Yhxx/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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