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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d5f05d5ec22bbd0e43b01105eac50d1b4761b952ab4b930a7e523dbdfb93e4' 
  AND token = 'WDmJpXJcXlqtR70SU6USS+sPkX11bdfR9HA1ttl9Zfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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