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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c793d5342c993962c88b43e228a5ff2d9efb038669a280a00bb4044d544d0fc8' 
  AND token = 'KFg6kMpfp7GVLD69y+I4TX8lE3BuIpB4H2GeD8rleG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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