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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dea31963f4d8384a93f7ea21b45dd4d4024776042598242e0da62d72cc7de8' 
  AND token = 'HoIseKCmvHI14Oi5pU4vFFEQQ5NNYfw3roRJr6xZkZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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