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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87675c9c955ef2fbc1dddc1f59b0737e639004c8368135270053306d338b059' 
  AND token = 'moDH9vv1IBaZ707I5HLA+acdjHvKHD31pSbcOwGl5Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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