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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6946c4bafc863bf1a2cbe067739bd0e7d8d2aa626d4db36f93b2639a7da544a8' 
  AND token = 'yuFwqbjb/xAuNpSYbOm7/eeD3qd+IjcI78tiVkuWSmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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