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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1e862f7acec4149f735d469b9b00a14b75aa9236f8844c1581c9edd806c802' 
  AND token = '+LniHomaWQx2JJVtzJE0r2zD5RLJ6lChJGkKHe29Q3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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