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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9a1c07428a7a3410a2e010be6505a3342dbc1fb99ade5c368e658b89ae5a70' 
  AND token = 'U0lhiPaOu1exdaZ2ce5WIlY0eW+PDr3jioDsx4Wsln8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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