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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a96b8f34da08097247ddc40a21c7b51192b6f96f042a213b3ec679a4ee6669' 
  AND token = 'aWHuwop8KGP4w1mFucUORx77UAre8BwOBZfEn/otI0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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