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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558cdbfc87ac8b9b0d2a2f5ede00dd14f73561f993c894718fcf955f73c33b6d' 
  AND token = 'FH73MsTr/mel6ENY3Buu34HmEyGKZ5sd9Q+KFf0WmPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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