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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09be7789677c4b23957210ee55101a64ae740341bf5c49c1ca91fef401e8bfb9' 
  AND token = 'IAnArZvj8keN9MsoSHNePpHhzPXCNeDuHNpd4KaRJDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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