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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44aa0a4d867a0979259fd4a595119491c5af82f909b825708342658fa9a51e03' 
  AND token = 'QzatNq+zrmFwvL526YoywYqPdzZjQ4kKme3owRUUavQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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