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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e674a92e67df44b852cc9cef86940df1d4e9b538790d8f153fa71fdeb9d046b' 
  AND token = 'bL5x496jia94NbRnR/0LgmQKePBxE8o3lRi40hfzgto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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