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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc452eff6c8036fcbab9ec978857ea84544c22a1f30bd15dcf7edfc5ff01578f' 
  AND token = '8uwNgZFHE0e5XwUFJJnKWei6Rvosb3YiI6kyLEsATw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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