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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6fa3669d22c2d2d7a539ee743b71e733fe39a3d230c8670c22cd7ca049cde2' 
  AND token = 'mtdW4P+1v91gLjmD/kauAQ36RHhP9+QUhkXs72F8xqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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