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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79aa5e77e1a9c68f4bd4210f3d7e7511ff95a77a5369b3112294ee5ae207413' 
  AND token = 'QPpJZR3Rkc4fpZjmS1CcDuDrymfM4A5X3/CCabP2SgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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