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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819ac7bd3c5fcedc3c69c300e3c0e4381ddb5844fee193f47f2df8fcb12e2583' 
  AND token = 'klHWNgcC83lr6u3I+zc8aTbt+T/G+kQ12EKV4ZNr5nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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