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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0d8092dddc48ea0e7bef026b819e7dd5b2ff30836c61d21ec4d154df858302' 
  AND token = 'mUOeMP4JDaUILaR3o42o4xWlr+cHPKMuYvpFdl9kdgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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