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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612b30044bac0c0baf699a2b812195729bc3eaf63d9998808e8aea79bbaae491' 
  AND token = 'ANd0JewK8N/gcXwzd+gF2kb2aOD9VZnsh1iWiNzK518=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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