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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4fa444329ae0645d4112832e7ec316599722c0be3b18c131561aa83b395db9' 
  AND token = 'N/M4J3w6HLcX/ezQPrR2Rl9FEiIJE9e8Ta301dp1+S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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