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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19a5ae6f99b5ca97efe64a33eb5919f0cbf777325ef6f7e74d267d76f728b54' 
  AND token = 'Gd02rrtPFqpbzYjeSof9DWtJ0j1/g3fXoOwjYhFKf1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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