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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb0df403da6987185da8af3f533e57e4fd2205e893c8c0dfaa05005fda84cbe' 
  AND token = 'A9sEZbALUit5ovTBkWNnhmTB6ip4iI9S00aAzod4EGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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