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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efd8fac371ed9b0781db65d8e6d988e6837ca740e462b010650e178c80ba95a' 
  AND token = 'AUAgo4o9sx3juScpv7E4gVdVa8yslPKCB2eyuoD2FpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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