SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1d118cc123f0e8619c84cf93e9493cc4d643d61640d1ed322d17178133ed02' 
  AND token = 'Fe7eSo88cy3ii4Gtsbtdn0C27HVyplINp+RK2bSyVLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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