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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564782a401a49f467ba6fce4ac0c1fa1994f585828a3bd206a307062a4f6b4f9' 
  AND token = 'Sywyc38q4KdLpOv6bfFQs0heZ59vHjN+gdtCI7G6D8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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