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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1529214f3f6a4bb58f53ae92040876a52f2d372b90a11986e5226d5ba6a3676d' 
  AND token = 'ULJJTqyx5o9faF4TKs9fwCVRxTqE6eZkAscDTx+Qluo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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