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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1899fde3744fe9643499f99f4daf769f9f0c4a950cb06c1188a38877cd89a28f' 
  AND token = 'RaQb7vGnDBel8iwQx/BJg2NV4JLOu+70oWfJnZ302iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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