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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887db8aebe44631f7e2dabafe475dd061917790fdae904d58353b5c6b9b075dd' 
  AND token = '+QnCC9v3BGYhvZ/phPZmaXHZb8t539H52cfqe4vvJ0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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