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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5a227cdc512ddbaac01ed60c537e881f482c8efa0e7d58f4f8a700e02bac2a' 
  AND token = 'nqju8AGJFK/OWXmkchyy3Jw7Shpe61MOILch5g1lWlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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