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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed681a4b83cef77e2ad49e29ba62f712526c8ef057d54421d21f5651b85b6650' 
  AND token = 'wMamcg5NZQx4aiOe7Fnlk+ulo75rvTMvGZpJqAlvZis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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