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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4589e799024abfff00fa7659416a84babb3199353cdc87bb311d8e47c0070ba2' 
  AND token = '27lVuxeUqyv4SWFcKXvGe0pPBWzoQA2eNA93/dMb5Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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