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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b7b72c78040b4602fb7a92e18b37db4d6ee843c643259c8ae0e325a08cbf0b' 
  AND token = 'gCxwymzM7KKETqtz5BnNpKaauBC3NRHvW4yX25zpcbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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