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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3038ef725d5e26b42a46db14d2db4a7803b1da580c562a251a5802458b1e8e5c' 
  AND token = 'LiOS6It9ktZEr8+3kiiJLgsVqv/p1NCQk73PL+oZIDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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