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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f15db80ad64a032748632ebd62660ad3386dbe50114c471f68f2b5bbbd4159d' 
  AND token = 'KLLOlOcu39sINajAcl+HoK1KWu1SSzQ1ce6SuJfqHRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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