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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f5c07a8fdad8804631585da47f802590176b8dbb6e9ebeffa0df3e7293f5e3' 
  AND token = 'vjMyeDghKO8Q3RjRDNRavniwQfWxuU/a6dzN5k0iqng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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