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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cbd2ff742ebb23ae19c7ea217082fef62d48ba70af21ad57c6d4cb10370e7a' 
  AND token = 'whqQ1BnqYaIkLVMY7DOWIJLIv1SxZpK34dZoo/TLTQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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