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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42da2bb3693457facdc51bd2de561ebfea5267a050a9d4f02cd02ea1eeb23c5d' 
  AND token = 'xppD3Su4RBWu6j52pge57yDlr5l0gx6R1mNWAtB5/YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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