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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e3ff51f940b5fdc7be21a6897e299d9f2bea9a8037577206156d83968bedec' 
  AND token = 'svg/HjIvpsxnwjNaI4cfa+d8sjEnVcL43LxDStER8yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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