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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f03363dfff89fc990f06cbb8ca73c7fde8146d999b6203e3d10bd1c9054d065' 
  AND token = '9B3HABU7cd9yxDE00WTwYWEc0Nba1ZLfaMmQeiTkI2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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