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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69c9d8b8fba26b738ae512dacc5f9ad59664c443e113de3165f1574e8adf4e3' 
  AND token = 'aX0OZz5wfbTwbeBkfPu3WDre8cmZNwCgrxEIf9anL3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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