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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e42cdc96841b2bef1debd2d75bbcea67d97c86698d520562f4e30be1ae924d6' 
  AND token = 'JNS+eDKcUDsPBBV9OyfSPnPGU/H/awIUIKNjBKsOLgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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