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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7244fb74994051f39fc247c7e97a869abc78cc9f868ae184ce3b1080fe6671dc' 
  AND token = '4zl45mjedhMOrLGLZ6GDOubPHR46iAnk1GmVQ0y8zYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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