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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8917793e926247ddf808fce686c24ea123b20a9d07a4e4206710d33e5bbbba' 
  AND token = 'hoeO7TvZ231YTp0vOScEDtyiZZc7XLe3gift2NrgS+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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