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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89aabd4da4f64a5852a1118988c4bc12e88fdb44b9671dc12b834ec4ce30ec4d' 
  AND token = 'CWseGCr37LUP1plRCCaHV42c2r/XuNITIlh24OH7SOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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