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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343fc8423692b1336686c514a7a372c83fad4bed59c8af5f1ee9d8dceda0bfce' 
  AND token = 'MhomkoBtK3lNg7JvAYYG5u0flPjx6EMJ0iGcYUuDYiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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